#include <stdio.h>

int main(void)
{
    double d1=1.5;
    double d2=2.5;
    double *ptr1=&d1;
    double *ptr2=&d2;
    printf("ptr2-ptr1=%ld\n",ptr2-ptr1);
    printf("ptr1-ptr2=%ld\n",ptr1-ptr2);
    return 0;
}